tcm_qla2xxx.c

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/*******************************************************************************
 * This file contains tcm implementation using v4 configfs fabric infrastructure
 * for QLogic target mode HBAs
 *
 * ?? Copyright 2010-2011 RisingTide Systems LLC.
 *
 * Licensed to the Linux Foundation under the General Public License (GPL)
 * version 2.
 *
 * Author: Nicholas A. Bellinger <[email protected]>
 *
 * tcm_qla2xxx_parse_wwn() and tcm_qla2xxx_format_wwn() contains code from
 * the TCM_FC / Open-FCoE.org fabric module.
 *
 * Copyright (c) 2010 Cisco Systems, Inc
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 ****************************************************************************/


#include <linux/module.h>
#include <linux/moduleparam.h>
#include <generated/utsrelease.h>
#include <linux/utsname.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/configfs.h>
#include <linux/ctype.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_cmnd.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>
#include <target/target_core_fabric_configfs.h>
#include <target/target_core_configfs.h>
#include <target/configfs_macros.h>

#include "qla_def.h"
#include "qla_target.h"
#include "tcm_qla2xxx.h"

struct workqueue_struct *tcm_qla2xxx_free_wq;
struct workqueue_struct *tcm_qla2xxx_cmd_wq;

static int tcm_qla2xxx_check_true(struct se_portal_group *se_tpg)
{
    return 1;
}

static int tcm_qla2xxx_check_false(struct se_portal_group *se_tpg)
{
    return 0;
}

/*
 * Parse WWN.
 * If strict, we require lower-case hex and colon separators to be sure
 * the name is the same as what would be generated by ft_format_wwn()
 * so the name and wwn are mapped one-to-one.
 */
static ssize_t tcm_qla2xxx_parse_wwn(const char *name, u64 *wwn, int strict)
{
    const char *cp;
    char c;
    u32 nibble;
    u32 byte = 0;
    u32 pos = 0;
    u32 err;

    *wwn = 0;
    for (cp = name; cp < &name[TCM_QLA2XXX_NAMELEN - 1]; cp++) {
        c = *cp;
        if (c == '\n' && cp[1] == '\0')
            continue;
        if (strict && pos++ == 2 && byte++ < 7) {
            pos = 0;
            if (c == ':')
                continue;
            err = 1;
            goto fail;
        }
        if (c == '\0') {
            err = 2;
            if (strict && byte != 8)
                goto fail;
            return cp - name;
        }
        err = 3;
        if (isdigit(c))
            nibble = c - '0';
        else if (isxdigit(c) && (islower(c) || !strict))
            nibble = tolower(c) - 'a' + 10;
        else
            goto fail;
        *wwn = (*wwn << 4) | nibble;
    }
    err = 4;
fail:
    pr_debug("err %u len %zu pos %u byte %u\n",
            err, cp - name, pos, byte);
    return -1;
}

static ssize_t tcm_qla2xxx_format_wwn(char *buf, size_t len, u64 wwn)
{
    u8 b[8];

    put_unaligned_be64(wwn, b);
    return snprintf(buf, len,
        "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
        b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
}

static char *tcm_qla2xxx_get_fabric_name(void)
{
    return "qla2xxx";
}

/*
 * From drivers/scsi/scsi_transport_fc.c:fc_parse_wwn
 */
static int tcm_qla2xxx_npiv_extract_wwn(const char *ns, u64 *nm)
{
    unsigned int i, j;
    u8 wwn[8];

    memset(wwn, 0, sizeof(wwn));

    /* Validate and store the new name */
    for (i = 0, j = 0; i < 16; i++) {
        int value;

        value = hex_to_bin(*ns++);
        if (value >= 0)
            j = (j << 4) | value;
        else
            return -EINVAL;

        if (i % 2) {
            wwn[i/2] = j & 0xff;
            j = 0;
        }
    }

    *nm = wwn_to_u64(wwn);
    return 0;
}

/*
 * This parsing logic follows drivers/scsi/scsi_transport_fc.c:
 * store_fc_host_vport_create()
 */
static int tcm_qla2xxx_npiv_parse_wwn(
    const char *name,
    size_t count,
    u64 *wwpn,
    u64 *wwnn)
{
    unsigned int cnt = count;
    int rc;

    *wwpn = 0;
    *wwnn = 0;

    /* count may include a LF at end of string */
    if (name[cnt-1] == '\n')
        cnt--;

    /* validate we have enough characters for WWPN */
    if ((cnt != (16+1+16)) || (name[16] != ':'))
        return -EINVAL;

    rc = tcm_qla2xxx_npiv_extract_wwn(&name[0], wwpn);
    if (rc != 0)
        return rc;

    rc = tcm_qla2xxx_npiv_extract_wwn(&name[17], wwnn);
    if (rc != 0)
        return rc;

    return 0;
}

static ssize_t tcm_qla2xxx_npiv_format_wwn(char *buf, size_t len,
                    u64 wwpn, u64 wwnn)
{
    u8 b[8], b2[8];

    put_unaligned_be64(wwpn, b);
    put_unaligned_be64(wwnn, b2);
    return snprintf(buf, len,
        "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x,"
        "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x",
        b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
        b2[0], b2[1], b2[2], b2[3], b2[4], b2[5], b2[6], b2[7]);
}

static char *tcm_qla2xxx_npiv_get_fabric_name(void)
{
    return "qla2xxx_npiv";
}

static u8 tcm_qla2xxx_get_fabric_proto_ident(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;
    u8 proto_id;

    switch (lport->lport_proto_id) {
    case SCSI_PROTOCOL_FCP:
    default:
        proto_id = fc_get_fabric_proto_ident(se_tpg);
        break;
    }

    return proto_id;
}

static char *tcm_qla2xxx_get_fabric_wwn(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;

    return lport->lport_naa_name;
}

static char *tcm_qla2xxx_npiv_get_fabric_wwn(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;

    return &lport->lport_npiv_name[0];
}

static u16 tcm_qla2xxx_get_tag(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    return tpg->lport_tpgt;
}

static u32 tcm_qla2xxx_get_default_depth(struct se_portal_group *se_tpg)
{
    return 1;
}

static u32 tcm_qla2xxx_get_pr_transport_id(
    struct se_portal_group *se_tpg,
    struct se_node_acl *se_nacl,
    struct t10_pr_registration *pr_reg,
    int *format_code,
    unsigned char *buf)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;
    int ret = 0;

    switch (lport->lport_proto_id) {
    case SCSI_PROTOCOL_FCP:
    default:
        ret = fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg,
                    format_code, buf);
        break;
    }

    return ret;
}

static u32 tcm_qla2xxx_get_pr_transport_id_len(
    struct se_portal_group *se_tpg,
    struct se_node_acl *se_nacl,
    struct t10_pr_registration *pr_reg,
    int *format_code)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;
    int ret = 0;

    switch (lport->lport_proto_id) {
    case SCSI_PROTOCOL_FCP:
    default:
        ret = fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg,
                    format_code);
        break;
    }

    return ret;
}

static char *tcm_qla2xxx_parse_pr_out_transport_id(
    struct se_portal_group *se_tpg,
    const char *buf,
    u32 *out_tid_len,
    char **port_nexus_ptr)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;
    char *tid = NULL;

    switch (lport->lport_proto_id) {
    case SCSI_PROTOCOL_FCP:
    default:
        tid = fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len,
                    port_nexus_ptr);
        break;
    }

    return tid;
}

static int tcm_qla2xxx_check_demo_mode(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);

    return QLA_TPG_ATTRIB(tpg)->generate_node_acls;
}

static int tcm_qla2xxx_check_demo_mode_cache(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);

    return QLA_TPG_ATTRIB(tpg)->cache_dynamic_acls;
}

static int tcm_qla2xxx_check_demo_write_protect(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);

    return QLA_TPG_ATTRIB(tpg)->demo_mode_write_protect;
}

static int tcm_qla2xxx_check_prod_write_protect(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);

    return QLA_TPG_ATTRIB(tpg)->prod_mode_write_protect;
}

static struct se_node_acl *tcm_qla2xxx_alloc_fabric_acl(
    struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_nacl *nacl;

    nacl = kzalloc(sizeof(struct tcm_qla2xxx_nacl), GFP_KERNEL);
    if (!nacl) {
        pr_err("Unable to alocate struct tcm_qla2xxx_nacl\n");
        return NULL;
    }

    return &nacl->se_node_acl;
}

static void tcm_qla2xxx_release_fabric_acl(
    struct se_portal_group *se_tpg,
    struct se_node_acl *se_nacl)
{
    struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
            struct tcm_qla2xxx_nacl, se_node_acl);
    kfree(nacl);
}

static u32 tcm_qla2xxx_tpg_get_inst_index(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
                struct tcm_qla2xxx_tpg, se_tpg);

    return tpg->lport_tpgt;
}

static void tcm_qla2xxx_complete_mcmd(struct work_struct *work)
{
    struct qla_tgt_mgmt_cmd *mcmd = container_of(work,
            struct qla_tgt_mgmt_cmd, free_work);

    transport_generic_free_cmd(&mcmd->se_cmd, 0);
}

/*
 * Called from qla_target_template->free_mcmd(), and will call
 * tcm_qla2xxx_release_cmd() via normal struct target_core_fabric_ops
 * release callback.  qla_hw_data->hardware_lock is expected to be held
 */
static void tcm_qla2xxx_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
{
    INIT_WORK(&mcmd->free_work, tcm_qla2xxx_complete_mcmd);
    queue_work(tcm_qla2xxx_free_wq, &mcmd->free_work);
}

static void tcm_qla2xxx_complete_free(struct work_struct *work)
{
    struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);

    transport_generic_free_cmd(&cmd->se_cmd, 0);
}

/*
 * Called from qla_target_template->free_cmd(), and will call
 * tcm_qla2xxx_release_cmd via normal struct target_core_fabric_ops
 * release callback.  qla_hw_data->hardware_lock is expected to be held
 */
static void tcm_qla2xxx_free_cmd(struct qla_tgt_cmd *cmd)
{
    INIT_WORK(&cmd->work, tcm_qla2xxx_complete_free);
    queue_work(tcm_qla2xxx_free_wq, &cmd->work);
}

/*
 * Called from struct target_core_fabric_ops->check_stop_free() context
 */
static int tcm_qla2xxx_check_stop_free(struct se_cmd *se_cmd)
{
    return target_put_sess_cmd(se_cmd->se_sess, se_cmd);
}

/* tcm_qla2xxx_release_cmd - Callback from TCM Core to release underlying
 * fabric descriptor @se_cmd command to release
 */
static void tcm_qla2xxx_release_cmd(struct se_cmd *se_cmd)
{
    struct qla_tgt_cmd *cmd;

    if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) {
        struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
                struct qla_tgt_mgmt_cmd, se_cmd);
        qlt_free_mcmd(mcmd);
        return;
    }

    cmd = container_of(se_cmd, struct qla_tgt_cmd, se_cmd);
    qlt_free_cmd(cmd);
}

static int tcm_qla2xxx_shutdown_session(struct se_session *se_sess)
{
    struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
    struct scsi_qla_host *vha;
    unsigned long flags;

    BUG_ON(!sess);
    vha = sess->vha;

    spin_lock_irqsave(&vha->hw->hardware_lock, flags);
    target_sess_cmd_list_set_waiting(se_sess);
    spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);

    return 1;
}

static void tcm_qla2xxx_close_session(struct se_session *se_sess)
{
    struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
    struct scsi_qla_host *vha;
    unsigned long flags;

    BUG_ON(!sess);
    vha = sess->vha;

    spin_lock_irqsave(&vha->hw->hardware_lock, flags);
    qlt_unreg_sess(sess);
    spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
}

static u32 tcm_qla2xxx_sess_get_index(struct se_session *se_sess)
{
    return 0;
}

/*
 * The LIO target core uses DMA_TO_DEVICE to mean that data is going
 * to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean
 * that data is coming from the target (eg handling a READ).  However,
 * this is just the opposite of what we have to tell the DMA mapping
 * layer -- eg when handling a READ, the HBA will have to DMA the data
 * out of memory so it can send it to the initiator, which means we
 * need to use DMA_TO_DEVICE when we map the data.
 */
static enum dma_data_direction tcm_qla2xxx_mapping_dir(struct se_cmd *se_cmd)
{
    if (se_cmd->se_cmd_flags & SCF_BIDI)
        return DMA_BIDIRECTIONAL;

    switch (se_cmd->data_direction) {
    case DMA_TO_DEVICE:
        return DMA_FROM_DEVICE;
    case DMA_FROM_DEVICE:
        return DMA_TO_DEVICE;
    case DMA_NONE:
    default:
        return DMA_NONE;
    }
}

static int tcm_qla2xxx_write_pending(struct se_cmd *se_cmd)
{
    struct qla_tgt_cmd *cmd = container_of(se_cmd,
                struct qla_tgt_cmd, se_cmd);

    cmd->bufflen = se_cmd->data_length;
    cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);

    cmd->sg_cnt = se_cmd->t_data_nents;
    cmd->sg = se_cmd->t_data_sg;

    /*
     * qla_target.c:qlt_rdy_to_xfer() will call pci_map_sg() to setup
     * the SGL mappings into PCIe memory for incoming FCP WRITE data.
     */
    return qlt_rdy_to_xfer(cmd);
}

static int tcm_qla2xxx_write_pending_status(struct se_cmd *se_cmd)
{
    unsigned long flags;
    /*
     * Check for WRITE_PENDING status to determine if we need to wait for
     * CTIO aborts to be posted via hardware in tcm_qla2xxx_handle_data().
     */
    spin_lock_irqsave(&se_cmd->t_state_lock, flags);
    if (se_cmd->t_state == TRANSPORT_WRITE_PENDING ||
        se_cmd->t_state == TRANSPORT_COMPLETE_QF_WP) {
        spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
        wait_for_completion_timeout(&se_cmd->t_transport_stop_comp,
                        3000);
        return 0;
    }
    spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);

    return 0;
}

static void tcm_qla2xxx_set_default_node_attrs(struct se_node_acl *nacl)
{
    return;
}

static u32 tcm_qla2xxx_get_task_tag(struct se_cmd *se_cmd)
{
    struct qla_tgt_cmd *cmd = container_of(se_cmd,
                struct qla_tgt_cmd, se_cmd);

    return cmd->tag;
}

static int tcm_qla2xxx_get_cmd_state(struct se_cmd *se_cmd)
{
    return 0;
}

/*
 * Called from process context in qla_target.c:qlt_do_work() code
 */
static int tcm_qla2xxx_handle_cmd(scsi_qla_host_t *vha, struct qla_tgt_cmd *cmd,
    unsigned char *cdb, uint32_t data_length, int fcp_task_attr,
    int data_dir, int bidi)
{
    struct se_cmd *se_cmd = &cmd->se_cmd;
    struct se_session *se_sess;
    struct qla_tgt_sess *sess;
    int flags = TARGET_SCF_ACK_KREF;

    if (bidi)
        flags |= TARGET_SCF_BIDI_OP;

    sess = cmd->sess;
    if (!sess) {
        pr_err("Unable to locate struct qla_tgt_sess from qla_tgt_cmd\n");
        return -EINVAL;
    }

    se_sess = sess->se_sess;
    if (!se_sess) {
        pr_err("Unable to locate active struct se_session\n");
        return -EINVAL;
    }

    return target_submit_cmd(se_cmd, se_sess, cdb, &cmd->sense_buffer[0],
                cmd->unpacked_lun, data_length, fcp_task_attr,
                data_dir, flags);
}

static void tcm_qla2xxx_handle_data_work(struct work_struct *work)
{
    struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);

    /*
     * Ensure that the complete FCP WRITE payload has been received.
     * Otherwise return an exception via CHECK_CONDITION status.
     */
    if (!cmd->write_data_transferred) {
        /*
         * Check if se_cmd has already been aborted via LUN_RESET, and
         * waiting upon completion in tcm_qla2xxx_write_pending_status()
         */
        if (cmd->se_cmd.transport_state & CMD_T_ABORTED) {
            complete(&cmd->se_cmd.t_transport_stop_comp);
            return;
        }

        cmd->se_cmd.scsi_sense_reason = TCM_CHECK_CONDITION_ABORT_CMD;
        transport_generic_request_failure(&cmd->se_cmd);
        return;
    }

    return target_execute_cmd(&cmd->se_cmd);
}

/*
 * Called from qla_target.c:qlt_do_ctio_completion()
 */
static void tcm_qla2xxx_handle_data(struct qla_tgt_cmd *cmd)
{
    INIT_WORK(&cmd->work, tcm_qla2xxx_handle_data_work);
    queue_work(tcm_qla2xxx_free_wq, &cmd->work);
}

/*
 * Called from qla_target.c:qlt_issue_task_mgmt()
 */
static int tcm_qla2xxx_handle_tmr(struct qla_tgt_mgmt_cmd *mcmd, uint32_t lun,
    uint8_t tmr_func, uint32_t tag)
{
    struct qla_tgt_sess *sess = mcmd->sess;
    struct se_cmd *se_cmd = &mcmd->se_cmd;

    return target_submit_tmr(se_cmd, sess->se_sess, NULL, lun, mcmd,
            tmr_func, GFP_ATOMIC, tag, TARGET_SCF_ACK_KREF);
}

static int tcm_qla2xxx_queue_data_in(struct se_cmd *se_cmd)
{
    struct qla_tgt_cmd *cmd = container_of(se_cmd,
                struct qla_tgt_cmd, se_cmd);

    cmd->bufflen = se_cmd->data_length;
    cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
    cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);

    cmd->sg_cnt = se_cmd->t_data_nents;
    cmd->sg = se_cmd->t_data_sg;
    cmd->offset = 0;

    /*
     * Now queue completed DATA_IN the qla2xxx LLD and response ring
     */
    return qlt_xmit_response(cmd, QLA_TGT_XMIT_DATA|QLA_TGT_XMIT_STATUS,
                se_cmd->scsi_status);
}

static int tcm_qla2xxx_queue_status(struct se_cmd *se_cmd)
{
    struct qla_tgt_cmd *cmd = container_of(se_cmd,
                struct qla_tgt_cmd, se_cmd);
    int xmit_type = QLA_TGT_XMIT_STATUS;

    cmd->bufflen = se_cmd->data_length;
    cmd->sg = NULL;
    cmd->sg_cnt = 0;
    cmd->offset = 0;
    cmd->dma_data_direction = tcm_qla2xxx_mapping_dir(se_cmd);
    cmd->aborted = (se_cmd->transport_state & CMD_T_ABORTED);

    if (se_cmd->data_direction == DMA_FROM_DEVICE) {
        /*
         * For FCP_READ with CHECK_CONDITION status, clear cmd->bufflen
         * for qla_tgt_xmit_response LLD code
         */
        se_cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT;
        se_cmd->residual_count = se_cmd->data_length;

        cmd->bufflen = 0;
    }
    /*
     * Now queue status response to qla2xxx LLD code and response ring
     */
    return qlt_xmit_response(cmd, xmit_type, se_cmd->scsi_status);
}

static int tcm_qla2xxx_queue_tm_rsp(struct se_cmd *se_cmd)
{
    struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
    struct qla_tgt_mgmt_cmd *mcmd = container_of(se_cmd,
                struct qla_tgt_mgmt_cmd, se_cmd);

    pr_debug("queue_tm_rsp: mcmd: %p func: 0x%02x response: 0x%02x\n",
            mcmd, se_tmr->function, se_tmr->response);
    /*
     * Do translation between TCM TM response codes and
     * QLA2xxx FC TM response codes.
     */
    switch (se_tmr->response) {
    case TMR_FUNCTION_COMPLETE:
        mcmd->fc_tm_rsp = FC_TM_SUCCESS;
        break;
    case TMR_TASK_DOES_NOT_EXIST:
        mcmd->fc_tm_rsp = FC_TM_BAD_CMD;
        break;
    case TMR_FUNCTION_REJECTED:
        mcmd->fc_tm_rsp = FC_TM_REJECT;
        break;
    case TMR_LUN_DOES_NOT_EXIST:
    default:
        mcmd->fc_tm_rsp = FC_TM_FAILED;
        break;
    }
    /*
     * Queue the TM response to QLA2xxx LLD to build a
     * CTIO response packet.
     */
    qlt_xmit_tm_rsp(mcmd);

    return 0;
}

/* Local pointer to allocated TCM configfs fabric module */
struct target_fabric_configfs *tcm_qla2xxx_fabric_configfs;
struct target_fabric_configfs *tcm_qla2xxx_npiv_fabric_configfs;

static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *,
            struct tcm_qla2xxx_nacl *, struct qla_tgt_sess *);
/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_clear_nacl_from_fcport_map(struct qla_tgt_sess *sess)
{
    struct se_node_acl *se_nacl = sess->se_sess->se_node_acl;
    struct se_portal_group *se_tpg = se_nacl->se_tpg;
    struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
    struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
                struct tcm_qla2xxx_lport, lport_wwn);
    struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
                struct tcm_qla2xxx_nacl, se_node_acl);
    void *node;

    pr_debug("fc_rport domain: port_id 0x%06x\n", nacl->nport_id);

    node = btree_remove32(&lport->lport_fcport_map, nacl->nport_id);
    WARN_ON(node && (node != se_nacl));

    pr_debug("Removed from fcport_map: %p for WWNN: 0x%016LX, port_id: 0x%06x\n",
        se_nacl, nacl->nport_wwnn, nacl->nport_id);
    /*
     * Now clear the se_nacl and session pointers from our HW lport lookup
     * table mapping for this initiator's fabric S_ID and LOOP_ID entries.
     *
     * This is done ahead of callbacks into tcm_qla2xxx_free_session() ->
     * target_wait_for_sess_cmds() before the session waits for outstanding
     * I/O to complete, to avoid a race between session shutdown execution
     * and incoming ATIOs or TMRs picking up a stale se_node_act reference.
     */
    tcm_qla2xxx_clear_sess_lookup(lport, nacl, sess);
}

static void tcm_qla2xxx_release_session(struct kref *kref)
{
    struct se_session *se_sess = container_of(kref,
            struct se_session, sess_kref);

    qlt_unreg_sess(se_sess->fabric_sess_ptr);
}

static void tcm_qla2xxx_put_session(struct se_session *se_sess)
{
    struct qla_tgt_sess *sess = se_sess->fabric_sess_ptr;
    struct qla_hw_data *ha = sess->vha->hw;
    unsigned long flags;

    spin_lock_irqsave(&ha->hardware_lock, flags);
    kref_put(&se_sess->sess_kref, tcm_qla2xxx_release_session);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static void tcm_qla2xxx_put_sess(struct qla_tgt_sess *sess)
{
    tcm_qla2xxx_put_session(sess->se_sess);
}

static void tcm_qla2xxx_shutdown_sess(struct qla_tgt_sess *sess)
{
    tcm_qla2xxx_shutdown_session(sess->se_sess);
}

static struct se_node_acl *tcm_qla2xxx_make_nodeacl(
    struct se_portal_group *se_tpg,
    struct config_group *group,
    const char *name)
{
    struct se_node_acl *se_nacl, *se_nacl_new;
    struct tcm_qla2xxx_nacl *nacl;
    u64 wwnn;
    u32 qla2xxx_nexus_depth;

    if (tcm_qla2xxx_parse_wwn(name, &wwnn, 1) < 0)
        return ERR_PTR(-EINVAL);

    se_nacl_new = tcm_qla2xxx_alloc_fabric_acl(se_tpg);
    if (!se_nacl_new)
        return ERR_PTR(-ENOMEM);
/* #warning FIXME: Hardcoded qla2xxx_nexus depth in tcm_qla2xxx_make_nodeacl */
    qla2xxx_nexus_depth = 1;

    /*
     * se_nacl_new may be released by core_tpg_add_initiator_node_acl()
     * when converting a NodeACL from demo mode -> explict
     */
    se_nacl = core_tpg_add_initiator_node_acl(se_tpg, se_nacl_new,
                name, qla2xxx_nexus_depth);
    if (IS_ERR(se_nacl)) {
        tcm_qla2xxx_release_fabric_acl(se_tpg, se_nacl_new);
        return se_nacl;
    }
    /*
     * Locate our struct tcm_qla2xxx_nacl and set the FC Nport WWPN
     */
    nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
    nacl->nport_wwnn = wwnn;
    tcm_qla2xxx_format_wwn(&nacl->nport_name[0], TCM_QLA2XXX_NAMELEN, wwnn);

    return se_nacl;
}

static void tcm_qla2xxx_drop_nodeacl(struct se_node_acl *se_acl)
{
    struct se_portal_group *se_tpg = se_acl->se_tpg;
    struct tcm_qla2xxx_nacl *nacl = container_of(se_acl,
                struct tcm_qla2xxx_nacl, se_node_acl);

    core_tpg_del_initiator_node_acl(se_tpg, se_acl, 1);
    kfree(nacl);
}

/* Start items for tcm_qla2xxx_tpg_attrib_cit */

#define DEF_QLA_TPG_ATTRIB(name)                    \
                                    \
static ssize_t tcm_qla2xxx_tpg_attrib_show_##name(          \
    struct se_portal_group *se_tpg,                 \
    char *page)                         \
{                                   \
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,      \
            struct tcm_qla2xxx_tpg, se_tpg);        \
                                    \
    return sprintf(page, "%u\n", QLA_TPG_ATTRIB(tpg)->name);    \
}                                   \
                                    \
static ssize_t tcm_qla2xxx_tpg_attrib_store_##name(         \
    struct se_portal_group *se_tpg,                 \
    const char *page,                       \
    size_t count)                           \
{                                   \
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,      \
            struct tcm_qla2xxx_tpg, se_tpg);        \
    unsigned long val;                      \
    int ret;                            \
                                    \
    ret = kstrtoul(page, 0, &val);                  \
    if (ret < 0) {                          \
        pr_err("kstrtoul() failed with"             \
                " ret: %d\n", ret);         \
        return -EINVAL;                     \
    }                               \
    ret = tcm_qla2xxx_set_attrib_##name(tpg, val);          \
                                    \
    return (!ret) ? count : -EINVAL;                \
}

#define DEF_QLA_TPG_ATTR_BOOL(_name)                    \
                                    \
static int tcm_qla2xxx_set_attrib_##_name(              \
    struct tcm_qla2xxx_tpg *tpg,                    \
    unsigned long val)                      \
{                                   \
    struct tcm_qla2xxx_tpg_attrib *a = &tpg->tpg_attrib;        \
                                    \
    if ((val != 0) && (val != 1)) {                 \
        pr_err("Illegal boolean value %lu\n", val);     \
        return -EINVAL;                     \
    }                               \
                                    \
    a->_name = val;                         \
    return 0;                           \
}

#define QLA_TPG_ATTR(_name, _mode) \
    TF_TPG_ATTRIB_ATTR(tcm_qla2xxx, _name, _mode);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_generate_node_acls
 */
DEF_QLA_TPG_ATTR_BOOL(generate_node_acls);
DEF_QLA_TPG_ATTRIB(generate_node_acls);
QLA_TPG_ATTR(generate_node_acls, S_IRUGO | S_IWUSR);

/*
 Define tcm_qla2xxx_attrib_s_cache_dynamic_acls
 */
DEF_QLA_TPG_ATTR_BOOL(cache_dynamic_acls);
DEF_QLA_TPG_ATTRIB(cache_dynamic_acls);
QLA_TPG_ATTR(cache_dynamic_acls, S_IRUGO | S_IWUSR);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_demo_mode_write_protect
 */
DEF_QLA_TPG_ATTR_BOOL(demo_mode_write_protect);
DEF_QLA_TPG_ATTRIB(demo_mode_write_protect);
QLA_TPG_ATTR(demo_mode_write_protect, S_IRUGO | S_IWUSR);

/*
 * Define tcm_qla2xxx_tpg_attrib_s_prod_mode_write_protect
 */
DEF_QLA_TPG_ATTR_BOOL(prod_mode_write_protect);
DEF_QLA_TPG_ATTRIB(prod_mode_write_protect);
QLA_TPG_ATTR(prod_mode_write_protect, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_tpg_attrib_attrs[] = {
    &tcm_qla2xxx_tpg_attrib_generate_node_acls.attr,
    &tcm_qla2xxx_tpg_attrib_cache_dynamic_acls.attr,
    &tcm_qla2xxx_tpg_attrib_demo_mode_write_protect.attr,
    &tcm_qla2xxx_tpg_attrib_prod_mode_write_protect.attr,
    NULL,
};

/* End items for tcm_qla2xxx_tpg_attrib_cit */

static ssize_t tcm_qla2xxx_tpg_show_enable(
    struct se_portal_group *se_tpg,
    char *page)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
            struct tcm_qla2xxx_tpg, se_tpg);

    return snprintf(page, PAGE_SIZE, "%d\n",
            atomic_read(&tpg->lport_tpg_enabled));
}

static ssize_t tcm_qla2xxx_tpg_store_enable(
    struct se_portal_group *se_tpg,
    const char *page,
    size_t count)
{
    struct se_wwn *se_wwn = se_tpg->se_tpg_wwn;
    struct tcm_qla2xxx_lport *lport = container_of(se_wwn,
            struct tcm_qla2xxx_lport, lport_wwn);
    struct scsi_qla_host *vha = lport->qla_vha;
    struct qla_hw_data *ha = vha->hw;
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
            struct tcm_qla2xxx_tpg, se_tpg);
    unsigned long op;
    int rc;

    rc = kstrtoul(page, 0, &op);
    if (rc < 0) {
        pr_err("kstrtoul() returned %d\n", rc);
        return -EINVAL;
    }
    if ((op != 1) && (op != 0)) {
        pr_err("Illegal value for tpg_enable: %lu\n", op);
        return -EINVAL;
    }

    if (op) {
        atomic_set(&tpg->lport_tpg_enabled, 1);
        qlt_enable_vha(vha);
    } else {
        if (!ha->tgt.qla_tgt) {
            pr_err("truct qla_hw_data *ha->tgt.qla_tgt is NULL\n");
            return -ENODEV;
        }
        atomic_set(&tpg->lport_tpg_enabled, 0);
        qlt_stop_phase1(ha->tgt.qla_tgt);
    }

    return count;
}

TF_TPG_BASE_ATTR(tcm_qla2xxx, enable, S_IRUGO | S_IWUSR);

static struct configfs_attribute *tcm_qla2xxx_tpg_attrs[] = {
    &tcm_qla2xxx_tpg_enable.attr,
    NULL,
};

static struct se_portal_group *tcm_qla2xxx_make_tpg(
    struct se_wwn *wwn,
    struct config_group *group,
    const char *name)
{
    struct tcm_qla2xxx_lport *lport = container_of(wwn,
            struct tcm_qla2xxx_lport, lport_wwn);
    struct tcm_qla2xxx_tpg *tpg;
    unsigned long tpgt;
    int ret;

    if (strstr(name, "tpgt_") != name)
        return ERR_PTR(-EINVAL);
    if (kstrtoul(name + 5, 10, &tpgt) || tpgt > USHRT_MAX)
        return ERR_PTR(-EINVAL);

    if (!lport->qla_npiv_vp && (tpgt != 1)) {
        pr_err("In non NPIV mode, a single TPG=1 is used for HW port mappings\n");
        return ERR_PTR(-ENOSYS);
    }

    tpg = kzalloc(sizeof(struct tcm_qla2xxx_tpg), GFP_KERNEL);
    if (!tpg) {
        pr_err("Unable to allocate struct tcm_qla2xxx_tpg\n");
        return ERR_PTR(-ENOMEM);
    }
    tpg->lport = lport;
    tpg->lport_tpgt = tpgt;
    /*
     * By default allow READ-ONLY TPG demo-mode access w/ cached dynamic
     * NodeACLs
     */
    QLA_TPG_ATTRIB(tpg)->generate_node_acls = 1;
    QLA_TPG_ATTRIB(tpg)->demo_mode_write_protect = 1;
    QLA_TPG_ATTRIB(tpg)->cache_dynamic_acls = 1;

    ret = core_tpg_register(&tcm_qla2xxx_fabric_configfs->tf_ops, wwn,
                &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
    if (ret < 0) {
        kfree(tpg);
        return NULL;
    }
    /*
     * Setup local TPG=1 pointer for non NPIV mode.
     */
    if (lport->qla_npiv_vp == NULL)
        lport->tpg_1 = tpg;

    return &tpg->se_tpg;
}

static void tcm_qla2xxx_drop_tpg(struct se_portal_group *se_tpg)
{
    struct tcm_qla2xxx_tpg *tpg = container_of(se_tpg,
            struct tcm_qla2xxx_tpg, se_tpg);
    struct tcm_qla2xxx_lport *lport = tpg->lport;
    struct scsi_qla_host *vha = lport->qla_vha;
    struct qla_hw_data *ha = vha->hw;
    /*
     * Call into qla2x_target.c LLD logic to shutdown the active
     * FC Nexuses and disable target mode operation for this qla_hw_data
     */
    if (ha->tgt.qla_tgt && !ha->tgt.qla_tgt->tgt_stop)
        qlt_stop_phase1(ha->tgt.qla_tgt);

    core_tpg_deregister(se_tpg);
    /*
     * Clear local TPG=1 pointer for non NPIV mode.
     */
    if (lport->qla_npiv_vp == NULL)
        lport->tpg_1 = NULL;

    kfree(tpg);
}

static struct se_portal_group *tcm_qla2xxx_npiv_make_tpg(
    struct se_wwn *wwn,
    struct config_group *group,
    const char *name)
{
    struct tcm_qla2xxx_lport *lport = container_of(wwn,
            struct tcm_qla2xxx_lport, lport_wwn);
    struct tcm_qla2xxx_tpg *tpg;
    unsigned long tpgt;
    int ret;

    if (strstr(name, "tpgt_") != name)
        return ERR_PTR(-EINVAL);
    if (kstrtoul(name + 5, 10, &tpgt) || tpgt > USHRT_MAX)
        return ERR_PTR(-EINVAL);

    tpg = kzalloc(sizeof(struct tcm_qla2xxx_tpg), GFP_KERNEL);
    if (!tpg) {
        pr_err("Unable to allocate struct tcm_qla2xxx_tpg\n");
        return ERR_PTR(-ENOMEM);
    }
    tpg->lport = lport;
    tpg->lport_tpgt = tpgt;

    ret = core_tpg_register(&tcm_qla2xxx_npiv_fabric_configfs->tf_ops, wwn,
                &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
    if (ret < 0) {
        kfree(tpg);
        return NULL;
    }
    return &tpg->se_tpg;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static struct qla_tgt_sess *tcm_qla2xxx_find_sess_by_s_id(
    scsi_qla_host_t *vha,
    const uint8_t *s_id)
{
    struct qla_hw_data *ha = vha->hw;
    struct tcm_qla2xxx_lport *lport;
    struct se_node_acl *se_nacl;
    struct tcm_qla2xxx_nacl *nacl;
    u32 key;

    lport = ha->tgt.target_lport_ptr;
    if (!lport) {
        pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
        dump_stack();
        return NULL;
    }

    key = (((unsigned long)s_id[0] << 16) |
           ((unsigned long)s_id[1] << 8) |
           (unsigned long)s_id[2]);
    pr_debug("find_sess_by_s_id: 0x%06x\n", key);

    se_nacl = btree_lookup32(&lport->lport_fcport_map, key);
    if (!se_nacl) {
        pr_debug("Unable to locate s_id: 0x%06x\n", key);
        return NULL;
    }
    pr_debug("find_sess_by_s_id: located se_nacl: %p, initiatorname: %s\n",
        se_nacl, se_nacl->initiatorname);

    nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
    if (!nacl->qla_tgt_sess) {
        pr_err("Unable to locate struct qla_tgt_sess\n");
        return NULL;
    }

    return nacl->qla_tgt_sess;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_set_sess_by_s_id(
    struct tcm_qla2xxx_lport *lport,
    struct se_node_acl *new_se_nacl,
    struct tcm_qla2xxx_nacl *nacl,
    struct se_session *se_sess,
    struct qla_tgt_sess *qla_tgt_sess,
    uint8_t *s_id)
{
    u32 key;
    void *slot;
    int rc;

    key = (((unsigned long)s_id[0] << 16) |
           ((unsigned long)s_id[1] << 8) |
           (unsigned long)s_id[2]);
    pr_debug("set_sess_by_s_id: %06x\n", key);

    slot = btree_lookup32(&lport->lport_fcport_map, key);
    if (!slot) {
        if (new_se_nacl) {
            pr_debug("Setting up new fc_port entry to new_se_nacl\n");
            nacl->nport_id = key;
            rc = btree_insert32(&lport->lport_fcport_map, key,
                    new_se_nacl, GFP_ATOMIC);
            if (rc)
                printk(KERN_ERR "Unable to insert s_id into fcport_map: %06x\n",
                    (int)key);
        } else {
            pr_debug("Wiping nonexisting fc_port entry\n");
        }

        qla_tgt_sess->se_sess = se_sess;
        nacl->qla_tgt_sess = qla_tgt_sess;
        return;
    }

    if (nacl->qla_tgt_sess) {
        if (new_se_nacl == NULL) {
            pr_debug("Clearing existing nacl->qla_tgt_sess and fc_port entry\n");
            btree_remove32(&lport->lport_fcport_map, key);
            nacl->qla_tgt_sess = NULL;
            return;
        }
        pr_debug("Replacing existing nacl->qla_tgt_sess and fc_port entry\n");
        btree_update32(&lport->lport_fcport_map, key, new_se_nacl);
        qla_tgt_sess->se_sess = se_sess;
        nacl->qla_tgt_sess = qla_tgt_sess;
        return;
    }

    if (new_se_nacl == NULL) {
        pr_debug("Clearing existing fc_port entry\n");
        btree_remove32(&lport->lport_fcport_map, key);
        return;
    }

    pr_debug("Replacing existing fc_port entry w/o active nacl->qla_tgt_sess\n");
    btree_update32(&lport->lport_fcport_map, key, new_se_nacl);
    qla_tgt_sess->se_sess = se_sess;
    nacl->qla_tgt_sess = qla_tgt_sess;

    pr_debug("Setup nacl->qla_tgt_sess %p by s_id for se_nacl: %p, initiatorname: %s\n",
        nacl->qla_tgt_sess, new_se_nacl, new_se_nacl->initiatorname);
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static struct qla_tgt_sess *tcm_qla2xxx_find_sess_by_loop_id(
    scsi_qla_host_t *vha,
    const uint16_t loop_id)
{
    struct qla_hw_data *ha = vha->hw;
    struct tcm_qla2xxx_lport *lport;
    struct se_node_acl *se_nacl;
    struct tcm_qla2xxx_nacl *nacl;
    struct tcm_qla2xxx_fc_loopid *fc_loopid;

    lport = ha->tgt.target_lport_ptr;
    if (!lport) {
        pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
        dump_stack();
        return NULL;
    }

    pr_debug("find_sess_by_loop_id: Using loop_id: 0x%04x\n", loop_id);

    fc_loopid = lport->lport_loopid_map + loop_id;
    se_nacl = fc_loopid->se_nacl;
    if (!se_nacl) {
        pr_debug("Unable to locate se_nacl by loop_id: 0x%04x\n",
            loop_id);
        return NULL;
    }

    nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);

    if (!nacl->qla_tgt_sess) {
        pr_err("Unable to locate struct qla_tgt_sess\n");
        return NULL;
    }

    return nacl->qla_tgt_sess;
}

/*
 * Expected to be called with struct qla_hw_data->hardware_lock held
 */
static void tcm_qla2xxx_set_sess_by_loop_id(
    struct tcm_qla2xxx_lport *lport,
    struct se_node_acl *new_se_nacl,
    struct tcm_qla2xxx_nacl *nacl,
    struct se_session *se_sess,
    struct qla_tgt_sess *qla_tgt_sess,
    uint16_t loop_id)
{
    struct se_node_acl *saved_nacl;
    struct tcm_qla2xxx_fc_loopid *fc_loopid;

    pr_debug("set_sess_by_loop_id: Using loop_id: 0x%04x\n", loop_id);

    fc_loopid = &((struct tcm_qla2xxx_fc_loopid *)
            lport->lport_loopid_map)[loop_id];

    saved_nacl = fc_loopid->se_nacl;
    if (!saved_nacl) {
        pr_debug("Setting up new fc_loopid->se_nacl to new_se_nacl\n");
        fc_loopid->se_nacl = new_se_nacl;
        if (qla_tgt_sess->se_sess != se_sess)
            qla_tgt_sess->se_sess = se_sess;
        if (nacl->qla_tgt_sess != qla_tgt_sess)
            nacl->qla_tgt_sess = qla_tgt_sess;
        return;
    }

    if (nacl->qla_tgt_sess) {
        if (new_se_nacl == NULL) {
            pr_debug("Clearing nacl->qla_tgt_sess and fc_loopid->se_nacl\n");
            fc_loopid->se_nacl = NULL;
            nacl->qla_tgt_sess = NULL;
            return;
        }

        pr_debug("Replacing existing nacl->qla_tgt_sess and fc_loopid->se_nacl\n");
        fc_loopid->se_nacl = new_se_nacl;
        if (qla_tgt_sess->se_sess != se_sess)
            qla_tgt_sess->se_sess = se_sess;
        if (nacl->qla_tgt_sess != qla_tgt_sess)
            nacl->qla_tgt_sess = qla_tgt_sess;
        return;
    }

    if (new_se_nacl == NULL) {
        pr_debug("Clearing fc_loopid->se_nacl\n");
        fc_loopid->se_nacl = NULL;
        return;
    }

    pr_debug("Replacing existing fc_loopid->se_nacl w/o active nacl->qla_tgt_sess\n");
    fc_loopid->se_nacl = new_se_nacl;
    if (qla_tgt_sess->se_sess != se_sess)
        qla_tgt_sess->se_sess = se_sess;
    if (nacl->qla_tgt_sess != qla_tgt_sess)
        nacl->qla_tgt_sess = qla_tgt_sess;

    pr_debug("Setup nacl->qla_tgt_sess %p by loop_id for se_nacl: %p, initiatorname: %s\n",
        nacl->qla_tgt_sess, new_se_nacl, new_se_nacl->initiatorname);
}

/*
 * Should always be called with qla_hw_data->hardware_lock held.
 */
static void tcm_qla2xxx_clear_sess_lookup(struct tcm_qla2xxx_lport *lport,
        struct tcm_qla2xxx_nacl *nacl, struct qla_tgt_sess *sess)
{
    struct se_session *se_sess = sess->se_sess;
    unsigned char be_sid[3];

    be_sid[0] = sess->s_id.b.domain;
    be_sid[1] = sess->s_id.b.area;
    be_sid[2] = sess->s_id.b.al_pa;

    tcm_qla2xxx_set_sess_by_s_id(lport, NULL, nacl, se_sess,
                sess, be_sid);
    tcm_qla2xxx_set_sess_by_loop_id(lport, NULL, nacl, se_sess,
                sess, sess->loop_id);
}

static void tcm_qla2xxx_free_session(struct qla_tgt_sess *sess)
{
    struct qla_tgt *tgt = sess->tgt;
    struct qla_hw_data *ha = tgt->ha;
    struct se_session *se_sess;
    struct se_node_acl *se_nacl;
    struct tcm_qla2xxx_lport *lport;
    struct tcm_qla2xxx_nacl *nacl;

    BUG_ON(in_interrupt());

    se_sess = sess->se_sess;
    if (!se_sess) {
        pr_err("struct qla_tgt_sess->se_sess is NULL\n");
        dump_stack();
        return;
    }
    se_nacl = se_sess->se_node_acl;
    nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);

    lport = ha->tgt.target_lport_ptr;
    if (!lport) {
        pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
        dump_stack();
        return;
    }
    target_wait_for_sess_cmds(se_sess, 0);

    transport_deregister_session_configfs(sess->se_sess);
    transport_deregister_session(sess->se_sess);
}

/*
 * Called via qlt_create_sess():ha->qla2x_tmpl->check_initiator_node_acl()
 * to locate struct se_node_acl
 */
static int tcm_qla2xxx_check_initiator_node_acl(
    scsi_qla_host_t *vha,
    unsigned char *fc_wwpn,
    void *qla_tgt_sess,
    uint8_t *s_id,
    uint16_t loop_id)
{
    struct qla_hw_data *ha = vha->hw;
    struct tcm_qla2xxx_lport *lport;
    struct tcm_qla2xxx_tpg *tpg;
    struct tcm_qla2xxx_nacl *nacl;
    struct se_portal_group *se_tpg;
    struct se_node_acl *se_nacl;
    struct se_session *se_sess;
    struct qla_tgt_sess *sess = qla_tgt_sess;
    unsigned char port_name[36];
    unsigned long flags;

    lport = ha->tgt.target_lport_ptr;
    if (!lport) {
        pr_err("Unable to locate struct tcm_qla2xxx_lport\n");
        dump_stack();
        return -EINVAL;
    }
    /*
     * Locate the TPG=1 reference..
     */
    tpg = lport->tpg_1;
    if (!tpg) {
        pr_err("Unable to lcoate struct tcm_qla2xxx_lport->tpg_1\n");
        return -EINVAL;
    }
    se_tpg = &tpg->se_tpg;

    se_sess = transport_init_session();
    if (IS_ERR(se_sess)) {
        pr_err("Unable to initialize struct se_session\n");
        return PTR_ERR(se_sess);
    }
    /*
     * Format the FCP Initiator port_name into colon seperated values to
     * match the format by tcm_qla2xxx explict ConfigFS NodeACLs.
     */
    memset(&port_name, 0, 36);
    snprintf(port_name, 36, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
        fc_wwpn[0], fc_wwpn[1], fc_wwpn[2], fc_wwpn[3], fc_wwpn[4],
        fc_wwpn[5], fc_wwpn[6], fc_wwpn[7]);
    /*
     * Locate our struct se_node_acl either from an explict NodeACL created
     * via ConfigFS, or via running in TPG demo mode.
     */
    se_sess->se_node_acl = core_tpg_check_initiator_node_acl(se_tpg,
                    port_name);
    if (!se_sess->se_node_acl) {
        transport_free_session(se_sess);
        return -EINVAL;
    }
    se_nacl = se_sess->se_node_acl;
    nacl = container_of(se_nacl, struct tcm_qla2xxx_nacl, se_node_acl);
    /*
     * And now setup the new se_nacl and session pointers into our HW lport
     * mappings for fabric S_ID and LOOP_ID.
     */
    spin_lock_irqsave(&ha->hardware_lock, flags);
    tcm_qla2xxx_set_sess_by_s_id(lport, se_nacl, nacl, se_sess,
            qla_tgt_sess, s_id);
    tcm_qla2xxx_set_sess_by_loop_id(lport, se_nacl, nacl, se_sess,
            qla_tgt_sess, loop_id);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    /*
     * Finally register the new FC Nexus with TCM
     */
    __transport_register_session(se_nacl->se_tpg, se_nacl, se_sess, sess);

    return 0;
}

static void tcm_qla2xxx_update_sess(struct qla_tgt_sess *sess, port_id_t s_id,
                    uint16_t loop_id, bool conf_compl_supported)
{
    struct qla_tgt *tgt = sess->tgt;
    struct qla_hw_data *ha = tgt->ha;
    struct tcm_qla2xxx_lport *lport = ha->tgt.target_lport_ptr;
    struct se_node_acl *se_nacl = sess->se_sess->se_node_acl;
    struct tcm_qla2xxx_nacl *nacl = container_of(se_nacl,
            struct tcm_qla2xxx_nacl, se_node_acl);
    u32 key;


    if (sess->loop_id != loop_id || sess->s_id.b24 != s_id.b24)
        pr_info("Updating session %p from port %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x loop_id %d -> %d s_id %x:%x:%x -> %x:%x:%x\n",
            sess,
            sess->port_name[0], sess->port_name[1],
            sess->port_name[2], sess->port_name[3],
            sess->port_name[4], sess->port_name[5],
            sess->port_name[6], sess->port_name[7],
            sess->loop_id, loop_id,
            sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa,
            s_id.b.domain, s_id.b.area, s_id.b.al_pa);

    if (sess->loop_id != loop_id) {
        /*
         * Because we can shuffle loop IDs around and we
         * update different sessions non-atomically, we might
         * have overwritten this session's old loop ID
         * already, and we might end up overwriting some other
         * session that will be updated later.  So we have to
         * be extra careful and we can't warn about those things...
         */
        if (lport->lport_loopid_map[sess->loop_id].se_nacl == se_nacl)
            lport->lport_loopid_map[sess->loop_id].se_nacl = NULL;

        lport->lport_loopid_map[loop_id].se_nacl = se_nacl;

        sess->loop_id = loop_id;
    }

    if (sess->s_id.b24 != s_id.b24) {
        key = (((u32) sess->s_id.b.domain << 16) |
               ((u32) sess->s_id.b.area   <<  8) |
               ((u32) sess->s_id.b.al_pa));

        if (btree_lookup32(&lport->lport_fcport_map, key))
            WARN(btree_remove32(&lport->lport_fcport_map, key) != se_nacl,
                 "Found wrong se_nacl when updating s_id %x:%x:%x\n",
                 sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa);
        else
            WARN(1, "No lport_fcport_map entry for s_id %x:%x:%x\n",
                 sess->s_id.b.domain, sess->s_id.b.area, sess->s_id.b.al_pa);

        key = (((u32) s_id.b.domain << 16) |
               ((u32) s_id.b.area   <<  8) |
               ((u32) s_id.b.al_pa));

        if (btree_lookup32(&lport->lport_fcport_map, key)) {
            WARN(1, "Already have lport_fcport_map entry for s_id %x:%x:%x\n",
                 s_id.b.domain, s_id.b.area, s_id.b.al_pa);
            btree_update32(&lport->lport_fcport_map, key, se_nacl);
        } else {
            btree_insert32(&lport->lport_fcport_map, key, se_nacl, GFP_ATOMIC);
        }

        sess->s_id = s_id;
        nacl->nport_id = key;
    }

    sess->conf_compl_supported = conf_compl_supported;
}

/*
 * Calls into tcm_qla2xxx used by qla2xxx LLD I/O path.
 */
static struct qla_tgt_func_tmpl tcm_qla2xxx_template = {
    .handle_cmd     = tcm_qla2xxx_handle_cmd,
    .handle_data        = tcm_qla2xxx_handle_data,
    .handle_tmr     = tcm_qla2xxx_handle_tmr,
    .free_cmd       = tcm_qla2xxx_free_cmd,
    .free_mcmd      = tcm_qla2xxx_free_mcmd,
    .free_session       = tcm_qla2xxx_free_session,
    .update_sess        = tcm_qla2xxx_update_sess,
    .check_initiator_node_acl = tcm_qla2xxx_check_initiator_node_acl,
    .find_sess_by_s_id  = tcm_qla2xxx_find_sess_by_s_id,
    .find_sess_by_loop_id   = tcm_qla2xxx_find_sess_by_loop_id,
    .clear_nacl_from_fcport_map = tcm_qla2xxx_clear_nacl_from_fcport_map,
    .put_sess       = tcm_qla2xxx_put_sess,
    .shutdown_sess      = tcm_qla2xxx_shutdown_sess,
};

static int tcm_qla2xxx_init_lport(struct tcm_qla2xxx_lport *lport)
{
    int rc;

    rc = btree_init32(&lport->lport_fcport_map);
    if (rc) {
        pr_err("Unable to initialize lport->lport_fcport_map btree\n");
        return rc;
    }

    lport->lport_loopid_map = vmalloc(sizeof(struct tcm_qla2xxx_fc_loopid) *
                65536);
    if (!lport->lport_loopid_map) {
        pr_err("Unable to allocate lport->lport_loopid_map of %zu bytes\n",
            sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
        btree_destroy32(&lport->lport_fcport_map);
        return -ENOMEM;
    }
    memset(lport->lport_loopid_map, 0, sizeof(struct tcm_qla2xxx_fc_loopid)
           * 65536);
    pr_debug("qla2xxx: Allocated lport_loopid_map of %zu bytes\n",
           sizeof(struct tcm_qla2xxx_fc_loopid) * 65536);
    return 0;
}

static int tcm_qla2xxx_lport_register_cb(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    struct tcm_qla2xxx_lport *lport;
    /*
     * Setup local pointer to vha, NPIV VP pointer (if present) and
     * vha->tcm_lport pointer
     */
    lport = (struct tcm_qla2xxx_lport *)ha->tgt.target_lport_ptr;
    lport->qla_vha = vha;

    return 0;
}

static struct se_wwn *tcm_qla2xxx_make_lport(
    struct target_fabric_configfs *tf,
    struct config_group *group,
    const char *name)
{
    struct tcm_qla2xxx_lport *lport;
    u64 wwpn;
    int ret = -ENODEV;

    if (tcm_qla2xxx_parse_wwn(name, &wwpn, 1) < 0)
        return ERR_PTR(-EINVAL);

    lport = kzalloc(sizeof(struct tcm_qla2xxx_lport), GFP_KERNEL);
    if (!lport) {
        pr_err("Unable to allocate struct tcm_qla2xxx_lport\n");
        return ERR_PTR(-ENOMEM);
    }
    lport->lport_wwpn = wwpn;
    tcm_qla2xxx_format_wwn(&lport->lport_name[0], TCM_QLA2XXX_NAMELEN,
                wwpn);
    sprintf(lport->lport_naa_name, "naa.%016llx", (unsigned long long) wwpn);

    ret = tcm_qla2xxx_init_lport(lport);
    if (ret != 0)
        goto out;

    ret = qlt_lport_register(&tcm_qla2xxx_template, wwpn,
                tcm_qla2xxx_lport_register_cb, lport);
    if (ret != 0)
        goto out_lport;

    return &lport->lport_wwn;
out_lport:
    vfree(lport->lport_loopid_map);
    btree_destroy32(&lport->lport_fcport_map);
out:
    kfree(lport);
    return ERR_PTR(ret);
}

static void tcm_qla2xxx_drop_lport(struct se_wwn *wwn)
{
    struct tcm_qla2xxx_lport *lport = container_of(wwn,
            struct tcm_qla2xxx_lport, lport_wwn);
    struct scsi_qla_host *vha = lport->qla_vha;
    struct qla_hw_data *ha = vha->hw;
    struct se_node_acl *node;
    u32 key = 0;

    /*
     * Call into qla2x_target.c LLD logic to complete the
     * shutdown of struct qla_tgt after the call to
     * qlt_stop_phase1() from tcm_qla2xxx_drop_tpg() above..
     */
    if (ha->tgt.qla_tgt && !ha->tgt.qla_tgt->tgt_stopped)
        qlt_stop_phase2(ha->tgt.qla_tgt);

    qlt_lport_deregister(vha);

    vfree(lport->lport_loopid_map);
    btree_for_each_safe32(&lport->lport_fcport_map, key, node)
        btree_remove32(&lport->lport_fcport_map, key);
    btree_destroy32(&lport->lport_fcport_map);
    kfree(lport);
}

static struct se_wwn *tcm_qla2xxx_npiv_make_lport(
    struct target_fabric_configfs *tf,
    struct config_group *group,
    const char *name)
{
    struct tcm_qla2xxx_lport *lport;
    u64 npiv_wwpn, npiv_wwnn;
    int ret;

    if (tcm_qla2xxx_npiv_parse_wwn(name, strlen(name)+1,
                &npiv_wwpn, &npiv_wwnn) < 0)
        return ERR_PTR(-EINVAL);

    lport = kzalloc(sizeof(struct tcm_qla2xxx_lport), GFP_KERNEL);
    if (!lport) {
        pr_err("Unable to allocate struct tcm_qla2xxx_lport for NPIV\n");
        return ERR_PTR(-ENOMEM);
    }
    lport->lport_npiv_wwpn = npiv_wwpn;
    lport->lport_npiv_wwnn = npiv_wwnn;
    tcm_qla2xxx_npiv_format_wwn(&lport->lport_npiv_name[0],
            TCM_QLA2XXX_NAMELEN, npiv_wwpn, npiv_wwnn);
    sprintf(lport->lport_naa_name, "naa.%016llx", (unsigned long long) npiv_wwpn);

/* FIXME: tcm_qla2xxx_npiv_make_lport */
    ret = -ENOSYS;
    if (ret != 0)
        goto out;

    return &lport->lport_wwn;
out:
    kfree(lport);
    return ERR_PTR(ret);
}

static void tcm_qla2xxx_npiv_drop_lport(struct se_wwn *wwn)
{
    struct tcm_qla2xxx_lport *lport = container_of(wwn,
            struct tcm_qla2xxx_lport, lport_wwn);
    struct scsi_qla_host *vha = lport->qla_vha;
    struct Scsi_Host *sh = vha->host;
    /*
     * Notify libfc that we want to release the lport->npiv_vport
     */
    fc_vport_terminate(lport->npiv_vport);

    scsi_host_put(sh);
    kfree(lport);
}


static ssize_t tcm_qla2xxx_wwn_show_attr_version(
    struct target_fabric_configfs *tf,
    char *page)
{
    return sprintf(page,
        "TCM QLOGIC QLA2XXX NPIV capable fabric module %s on %s/%s on "
        UTS_RELEASE"\n", TCM_QLA2XXX_VERSION, utsname()->sysname,
        utsname()->machine);
}

TF_WWN_ATTR_RO(tcm_qla2xxx, version);

static struct configfs_attribute *tcm_qla2xxx_wwn_attrs[] = {
    &tcm_qla2xxx_wwn_version.attr,
    NULL,
};

static struct target_core_fabric_ops tcm_qla2xxx_ops = {
    .get_fabric_name        = tcm_qla2xxx_get_fabric_name,
    .get_fabric_proto_ident     = tcm_qla2xxx_get_fabric_proto_ident,
    .tpg_get_wwn            = tcm_qla2xxx_get_fabric_wwn,
    .tpg_get_tag            = tcm_qla2xxx_get_tag,
    .tpg_get_default_depth      = tcm_qla2xxx_get_default_depth,
    .tpg_get_pr_transport_id    = tcm_qla2xxx_get_pr_transport_id,
    .tpg_get_pr_transport_id_len    = tcm_qla2xxx_get_pr_transport_id_len,
    .tpg_parse_pr_out_transport_id  = tcm_qla2xxx_parse_pr_out_transport_id,
    .tpg_check_demo_mode        = tcm_qla2xxx_check_demo_mode,
    .tpg_check_demo_mode_cache  = tcm_qla2xxx_check_demo_mode_cache,
    .tpg_check_demo_mode_write_protect =
                    tcm_qla2xxx_check_demo_write_protect,
    .tpg_check_prod_mode_write_protect =
                    tcm_qla2xxx_check_prod_write_protect,
    .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_true,
    .tpg_alloc_fabric_acl       = tcm_qla2xxx_alloc_fabric_acl,
    .tpg_release_fabric_acl     = tcm_qla2xxx_release_fabric_acl,
    .tpg_get_inst_index     = tcm_qla2xxx_tpg_get_inst_index,
    .check_stop_free        = tcm_qla2xxx_check_stop_free,
    .release_cmd            = tcm_qla2xxx_release_cmd,
    .put_session            = tcm_qla2xxx_put_session,
    .shutdown_session       = tcm_qla2xxx_shutdown_session,
    .close_session          = tcm_qla2xxx_close_session,
    .sess_get_index         = tcm_qla2xxx_sess_get_index,
    .sess_get_initiator_sid     = NULL,
    .write_pending          = tcm_qla2xxx_write_pending,
    .write_pending_status       = tcm_qla2xxx_write_pending_status,
    .set_default_node_attributes    = tcm_qla2xxx_set_default_node_attrs,
    .get_task_tag           = tcm_qla2xxx_get_task_tag,
    .get_cmd_state          = tcm_qla2xxx_get_cmd_state,
    .queue_data_in          = tcm_qla2xxx_queue_data_in,
    .queue_status           = tcm_qla2xxx_queue_status,
    .queue_tm_rsp           = tcm_qla2xxx_queue_tm_rsp,
    /*
     * Setup function pointers for generic logic in
     * target_core_fabric_configfs.c
     */
    .fabric_make_wwn        = tcm_qla2xxx_make_lport,
    .fabric_drop_wwn        = tcm_qla2xxx_drop_lport,
    .fabric_make_tpg        = tcm_qla2xxx_make_tpg,
    .fabric_drop_tpg        = tcm_qla2xxx_drop_tpg,
    .fabric_post_link       = NULL,
    .fabric_pre_unlink      = NULL,
    .fabric_make_np         = NULL,
    .fabric_drop_np         = NULL,
    .fabric_make_nodeacl        = tcm_qla2xxx_make_nodeacl,
    .fabric_drop_nodeacl        = tcm_qla2xxx_drop_nodeacl,
};

static struct target_core_fabric_ops tcm_qla2xxx_npiv_ops = {
    .get_fabric_name        = tcm_qla2xxx_npiv_get_fabric_name,
    .get_fabric_proto_ident     = tcm_qla2xxx_get_fabric_proto_ident,
    .tpg_get_wwn            = tcm_qla2xxx_npiv_get_fabric_wwn,
    .tpg_get_tag            = tcm_qla2xxx_get_tag,
    .tpg_get_default_depth      = tcm_qla2xxx_get_default_depth,
    .tpg_get_pr_transport_id    = tcm_qla2xxx_get_pr_transport_id,
    .tpg_get_pr_transport_id_len    = tcm_qla2xxx_get_pr_transport_id_len,
    .tpg_parse_pr_out_transport_id  = tcm_qla2xxx_parse_pr_out_transport_id,
    .tpg_check_demo_mode        = tcm_qla2xxx_check_false,
    .tpg_check_demo_mode_cache  = tcm_qla2xxx_check_true,
    .tpg_check_demo_mode_write_protect = tcm_qla2xxx_check_true,
    .tpg_check_prod_mode_write_protect = tcm_qla2xxx_check_false,
    .tpg_check_demo_mode_login_only = tcm_qla2xxx_check_true,
    .tpg_alloc_fabric_acl       = tcm_qla2xxx_alloc_fabric_acl,
    .tpg_release_fabric_acl     = tcm_qla2xxx_release_fabric_acl,
    .tpg_get_inst_index     = tcm_qla2xxx_tpg_get_inst_index,
    .release_cmd            = tcm_qla2xxx_release_cmd,
    .put_session            = tcm_qla2xxx_put_session,
    .shutdown_session       = tcm_qla2xxx_shutdown_session,
    .close_session          = tcm_qla2xxx_close_session,
    .sess_get_index         = tcm_qla2xxx_sess_get_index,
    .sess_get_initiator_sid     = NULL,
    .write_pending          = tcm_qla2xxx_write_pending,
    .write_pending_status       = tcm_qla2xxx_write_pending_status,
    .set_default_node_attributes    = tcm_qla2xxx_set_default_node_attrs,
    .get_task_tag           = tcm_qla2xxx_get_task_tag,
    .get_cmd_state          = tcm_qla2xxx_get_cmd_state,
    .queue_data_in          = tcm_qla2xxx_queue_data_in,
    .queue_status           = tcm_qla2xxx_queue_status,
    .queue_tm_rsp           = tcm_qla2xxx_queue_tm_rsp,
    /*
     * Setup function pointers for generic logic in
     * target_core_fabric_configfs.c
     */
    .fabric_make_wwn        = tcm_qla2xxx_npiv_make_lport,
    .fabric_drop_wwn        = tcm_qla2xxx_npiv_drop_lport,
    .fabric_make_tpg        = tcm_qla2xxx_npiv_make_tpg,
    .fabric_drop_tpg        = tcm_qla2xxx_drop_tpg,
    .fabric_post_link       = NULL,
    .fabric_pre_unlink      = NULL,
    .fabric_make_np         = NULL,
    .fabric_drop_np         = NULL,
    .fabric_make_nodeacl        = tcm_qla2xxx_make_nodeacl,
    .fabric_drop_nodeacl        = tcm_qla2xxx_drop_nodeacl,
};

static int tcm_qla2xxx_register_configfs(void)
{
    struct target_fabric_configfs *fabric, *npiv_fabric;
    int ret;

    pr_debug("TCM QLOGIC QLA2XXX fabric module %s on %s/%s on "
        UTS_RELEASE"\n", TCM_QLA2XXX_VERSION, utsname()->sysname,
        utsname()->machine);
    /*
     * Register the top level struct config_item_type with TCM core
     */
    fabric = target_fabric_configfs_init(THIS_MODULE, "qla2xxx");
    if (IS_ERR(fabric)) {
        pr_err("target_fabric_configfs_init() failed\n");
        return PTR_ERR(fabric);
    }
    /*
     * Setup fabric->tf_ops from our local tcm_qla2xxx_ops
     */
    fabric->tf_ops = tcm_qla2xxx_ops;
    /*
     * Setup default attribute lists for various fabric->tf_cit_tmpl
     */
    TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = tcm_qla2xxx_wwn_attrs;
    TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = tcm_qla2xxx_tpg_attrs;
    TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs =
                        tcm_qla2xxx_tpg_attrib_attrs;
    TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
    TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
    TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
    TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
    TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
    TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
    /*
     * Register the fabric for use within TCM
     */
    ret = target_fabric_configfs_register(fabric);
    if (ret < 0) {
        pr_err("target_fabric_configfs_register() failed for TCM_QLA2XXX\n");
        return ret;
    }
    /*
     * Setup our local pointer to *fabric
     */
    tcm_qla2xxx_fabric_configfs = fabric;
    pr_debug("TCM_QLA2XXX[0] - Set fabric -> tcm_qla2xxx_fabric_configfs\n");

    /*
     * Register the top level struct config_item_type for NPIV with TCM core
     */
    npiv_fabric = target_fabric_configfs_init(THIS_MODULE, "qla2xxx_npiv");
    if (IS_ERR(npiv_fabric)) {
        pr_err("target_fabric_configfs_init() failed\n");
        ret = PTR_ERR(npiv_fabric);
        goto out_fabric;
    }
    /*
     * Setup fabric->tf_ops from our local tcm_qla2xxx_npiv_ops
     */
    npiv_fabric->tf_ops = tcm_qla2xxx_npiv_ops;
    /*
     * Setup default attribute lists for various npiv_fabric->tf_cit_tmpl
     */
    TF_CIT_TMPL(npiv_fabric)->tfc_wwn_cit.ct_attrs = tcm_qla2xxx_wwn_attrs;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_base_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_param_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_base_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
    TF_CIT_TMPL(npiv_fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL;
    /*
     * Register the npiv_fabric for use within TCM
     */
    ret = target_fabric_configfs_register(npiv_fabric);
    if (ret < 0) {
        pr_err("target_fabric_configfs_register() failed for TCM_QLA2XXX\n");
        goto out_fabric;
    }
    /*
     * Setup our local pointer to *npiv_fabric
     */
    tcm_qla2xxx_npiv_fabric_configfs = npiv_fabric;
    pr_debug("TCM_QLA2XXX[0] - Set fabric -> tcm_qla2xxx_npiv_fabric_configfs\n");

    tcm_qla2xxx_free_wq = alloc_workqueue("tcm_qla2xxx_free",
                        WQ_MEM_RECLAIM, 0);
    if (!tcm_qla2xxx_free_wq) {
        ret = -ENOMEM;
        goto out_fabric_npiv;
    }

    tcm_qla2xxx_cmd_wq = alloc_workqueue("tcm_qla2xxx_cmd", 0, 0);
    if (!tcm_qla2xxx_cmd_wq) {
        ret = -ENOMEM;
        goto out_free_wq;
    }

    return 0;

out_free_wq:
    destroy_workqueue(tcm_qla2xxx_free_wq);
out_fabric_npiv:
    target_fabric_configfs_deregister(tcm_qla2xxx_npiv_fabric_configfs);
out_fabric:
    target_fabric_configfs_deregister(tcm_qla2xxx_fabric_configfs);
    return ret;
}

static void tcm_qla2xxx_deregister_configfs(void)
{
    destroy_workqueue(tcm_qla2xxx_cmd_wq);
    destroy_workqueue(tcm_qla2xxx_free_wq);

    target_fabric_configfs_deregister(tcm_qla2xxx_fabric_configfs);
    tcm_qla2xxx_fabric_configfs = NULL;
    pr_debug("TCM_QLA2XXX[0] - Cleared tcm_qla2xxx_fabric_configfs\n");

    target_fabric_configfs_deregister(tcm_qla2xxx_npiv_fabric_configfs);
    tcm_qla2xxx_npiv_fabric_configfs = NULL;
    pr_debug("TCM_QLA2XXX[0] - Cleared tcm_qla2xxx_npiv_fabric_configfs\n");
}

static int __init tcm_qla2xxx_init(void)
{
    int ret;

    ret = tcm_qla2xxx_register_configfs();
    if (ret < 0)
        return ret;

    return 0;
}

static void __exit tcm_qla2xxx_exit(void)
{
    tcm_qla2xxx_deregister_configfs();
}

MODULE_DESCRIPTION("TCM QLA2XXX series NPIV enabled fabric driver");
MODULE_LICENSE("GPL");
module_init(tcm_qla2xxx_init);
module_exit(tcm_qla2xxx_exit);